Synonyms and related words :
Spartan, accepting, armed with patience, assiduous, balking, balky, bigoted, bound, bound and determined, bulldogged, bulletheaded, bullheaded, case-hardened, committed, constant, continuing, decided, decisive, dedicated, definite, determined, devoted, diligent, disciplined, dogged, dogmatic, earnest, endurant, enduring, faithful, fanatic, forbearing, hardheaded, headstrong, immutable, inalterable, indefatigable, indomitable, indulgent, industrious, insistent, intolerant, invincible, lasting, lenient, long-suffering, longanimous, loyal, mulish, never-tiring, obstinate, opinionated, overzealous, patient, patient as Job, permanent, perseverant, persistent, persisting, pertinacious, philosophical, pigheaded, plodding, plugging, preoccupied, purposeful, rapt, relentless, resolute, resolved, restive, sedulous, self-controlled, self-willed, serious, set, sincere, single-minded, sleepless, slogging, stable, steadfast, steady, stiff-necked, stoic, strong-willed, strongheaded, stubborn, sulky, sullen, tenacious, tireless, tolerant, tolerating, tolerative, unabating, unconquerable, uncooperative, undaunted, understanding, undiscouraged, undrooping, unfailing, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unregenerate, unrelaxing, unrelenting, unremitting, unsleeping, unswerving, untiring, unwavering, unwearied, unwearying, unwinking, utterly attentive, weariless, wholehearted, willful